Posted April 19, 2013 by Oscar in Tech

How To Read Engine DTC Errors: Jeep Wrangler 1996-2013

Jeep Dash
Jeep Dash

The Jeep Wrangler TJ and JK are equipped with an OBD. OBD stands for On-Board Diagnostics. OBD-II (OBD two) is the latest industry standard, which was introduced on 1996 vehicle models. It provides monitoring of nearly all engine controls, and also some other parts of the vehicle (chassis, body, etc.). The most useful part of OBD to most drivers is the ability to read information from the vehicle. You can read trouble codes, and even monitor real-time statistics such as RPM, vehicle speed, etc. Below is how to read the Diagnostic Trouble Codes or DTC Errors for both the TJ and JK

How To Read DTC (Diagnostic Trouble Code) on the Jeep Wrangler JK

1. To check your Jeep JK Wrangler’s DTC codes, simply insert your key into the ignition, turn it to the ‘ON’ position but do not start the engine. Then, push the key into the ignition cylinder and while holding it in, turn it to the ‘OFF’ position and then back to the ‘ON’ position (3) times straight making sure to end with it in the ‘ON’ position. It is important to keep pushing in on the key to prevent it from catching at the different positions along the way.

2. If you do step #1 correctly, all your dash lights will illuminate and your odometer will show up as a series of (6) dashes. If your Jeep JK Wrangler has logged any DTC’s, they will be displayed soon after the dashes appear. Write down the DTC(s).

3. If your Jeep JK Wrangler has not logged any DTC’s, the dashes on your odometer will be followed by the message ‘-done-’. Turn your key to the ‘OFF’ position and you will in fact be done.

How To Read DTC (Diagnostic Trouble Code) on the Jeep Wrangler TJ

  • Turn the ignition key ON THREE TIMES in succession:
    ON : OFF : ON : OFF : ON
    (within FIVE seconds)
  • Count the number of times the check engine lamp on the dash flashes. The number of flashes represents the error code. There will be a short pause between the flashes representing the different digits of the code. Longer pauses separate individual trouble codes. Codes on 1999 and newer TJs will be displayed in the odometer.
  • Code 55 will be the last code to be displayed.